Fire-resistant mica tape and method of processing

Abstract

The present application relates to the technical field of mica tape, particularly relates to a fire-resistant mica tape and a processing method thereof, the fire-resistant mica tape comprises a mica layer in the middle, a first adhesive layer is coated on one side of the mica layer, a fiber layer is arranged on the outer side of the first adhesive layer, a second adhesive layer is coated on the other side of the mica layer, and a carbon-free film layer is arranged on the outer side of the second adhesive layer.The processing method comprises the following steps: S1, preparing a fiber cloth, a mica paper, a carbon-free film and a rope net; S2, preparing a glue solvent; S3, coating the glue solvent on one side of the fiber cloth, laying the rope net on the sprayed glue solvent, and spraying the glue solvent again; S4, laying the mica paper on the outer side of the first adhesive layer, spraying the glue solvent and the carbon-free film on the outer side of the mica paper; S4, performing compounding by a compounding machine, and performing first drying; S5, performing pressing, forming a long groove on one side of the carbon-free film layer, and forming a convex rib on the other side; and S5, performing second drying.The stability of the fire resistance of the product is improved.

Description

Technical Field

[0001] This invention relates to the field of mica tape technology, and in particular to a fire-resistant mica tape and its processing method. Background Technology

[0002] Mica tape, also known as fire-resistant mica tape, is a fire-resistant insulating material produced by a mica tape machine. It can be categorized by application: mica tape for motors and mica tape for cables. By structure: double-sided tape, single-sided tape, three-in-one tape, double-film tape, single-film tape, etc. Based on mica type, it can be classified as: synthetic mica tape, phlogopite mica tape, and muscovite mica tape. Fire-resistant safety cable mica tape is a high-performance mica insulation product with excellent high-temperature resistance and flame retardancy.

[0003] Fire-resistant mica tape is an important material in the production of fire-resistant cables. It is mainly made by bonding a layer of glass fiber cloth with a layer of mica and then drying it. It has excellent high temperature resistance and flame resistance. Mica tape has good flexibility in its normal state and is suitable for the main fire-resistant insulation layer in various fire-resistant wires and cables.

[0004] When manufacturing fire-resistant cables, fire-resistant mica tape is wrapped around the outside to provide fire protection. However, because traditional fire-resistant mica tape has insufficient fire resistance, multiple layers of mica tape need to be wrapped around the surface to improve fire resistance and fire rating. However, due to the inherent properties of mica tape, adjacent layers may detach during the wrapping process, thus affecting the product's fire resistance. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this invention provides a fire-resistant mica tape and its processing method, which avoids the separation of adjacent layers of mica tape, thereby ensuring the stability of the product's fire resistance performance.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this application provides a fire-resistant mica tape, comprising a mica layer in the middle, a first adhesive layer coated on one side of the mica layer, a fiber layer disposed on the outside of the first adhesive layer, a second adhesive layer coated on the other side of the mica layer away from the first adhesive layer, and a carbon-free thin film layer disposed on the outside of the second adhesive layer.

[0009] Preferably, a mesh layer is provided between the first adhesive layer and the fiber layer.

[0010] Preferably, the mesh layer includes a first mesh area and a second mesh area formed by dividing the central axis along the length direction of the mica strip. The first mesh area and the second mesh area are located on both sides of the central axis and are connected to each other. The fiber layer forms an outwardly protruding ridge on the side near the first mesh area, and a concave long groove is formed on the outer side of the carbon-free film layer. The length direction of the ridge and the long groove is parallel to the length direction of the mica strip. After one winding, the long groove is sleeved on the outside of the ridge.

[0011] Preferably, the first mesh area includes multiple long ropes parallel to the length direction of the mica strip and multiple short ropes perpendicular to the length direction of the mica strip. The diameter of the first long rope is 0.2-0.5 mm, and the diameter of the short rope is 0.05-0.1 mm. The first long rope pushes the fiber layer outward to form the convex ridge.

[0012] Preferably, the second net area includes a mesh-like fine rope with a diameter of 0.05-0.1 mm.

[0013] To achieve the above objectives, this application provides a method for processing refractory mica tape, used for processing the refractory mica tape according to any one of claims 1-5, characterized by comprising the following steps:

[0014] S1. Prepare fiber cloth, mica paper, carbon-free film and rope net;

[0015] S2. Mix the resin solution and diluent to prepare a resin solvent with a glue content of 19%-25%;

[0016] S3. Spray adhesive solvent onto one side of the fiber cloth. After spraying the adhesive solvent, lay a rope net on the top side of the sprayed adhesive solvent and spray adhesive solvent a second time to form the first adhesive layer.

[0017] S4. Lay mica paper on the upper side of the first adhesive layer, spray adhesive flux on the outer side of the mica paper, and then lay a carbon-free film on the upper side of the sprayed adhesive flux.

[0018] S4. The lamination is carried out by a laminating machine and then dried for the first time in a drying oven;

[0019] S5. Pressing is performed using a corresponding mold to form a long groove on one side of the carbon-free thin film layer and a raised ridge on the other side.

[0020] S5. Perform secondary drying.

[0021] Preferably, in step S4, the drying temperature during the first drying is 70-80 degrees Celsius.

[0022] Preferably, the total duration of the secondary drying is 7-10 minutes, including an initial drying stage, an intermediate drying stage, and a cooling stage; the drying time of the initial drying stage is 1-2 minutes, and the drying temperature of the initial drying stage is 70-80 degrees Celsius; the drying time of the intermediate drying stage is 4-6 minutes, and the drying temperature of the intermediate drying stage is 120-140 degrees Celsius.

[0023] (III) Beneficial Effects

[0024] This invention provides a fire-resistant mica tape and its processing method. By using a mesh layer disposed within a first adhesive layer, during the forming of the mica tape, a raised ridge is formed on the side of the mica tape near the first mesh area, and a long groove is formed on the other side of the mica tape near the second mesh area. When the mica tape is wrapped around the outside of a cable and overlaps with each other, the adjacent layers of mica tape form a half-overlap relationship. After the overlap, due to the limiting effect of the long groove and the raised ridge, the adjacent layers of mica tape are prevented from detaching, thereby ensuring the stability of the product's fire resistance performance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a fire-resistant mica tape according to the present invention;

[0026] Figure 2 This is a schematic diagram of a protruding mesh layer in a fire-resistant mica tape according to the present invention;

[0027] Figure 3 This is a diagram showing the state of overlapping adjacent layers of mica tape in a fire-resistant mica tape according to the present invention.

[0028] Marked in the attached diagram:

[0029] 100. Mica layer; 200. First adhesive layer; 300. Fiber layer; 310. Rib; 400. Second adhesive layer; 500. Carbon-free film layer; 510. Long groove; 600. Net layer; 610. First net area; 611. First long rope; 612. Short rope; 620. Second net area; 621. Fine rope. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Example 1

[0032] This invention provides a fire-resistant mica tape, see [link / reference]. Figures 1-3The mica tape includes a central mica layer 100, a first adhesive layer 200 coated on one side of the mica layer 100, a fiber layer 300 disposed outside the first adhesive layer 200, a second adhesive layer 400 coated on the other side of the mica layer 100 away from the first adhesive layer 200, and a non-carbonized film layer 500 disposed outside the second adhesive layer 400. The fiber layer 300 and the non-carbonized film layer 500 disposed on both sides of the mica layer 100 improve the overall fire resistance of the mica tape.

[0033] Furthermore, a mesh layer 600 is provided between the first adhesive layer 200 and the fiber layer 300.

[0034] The mesh layer 600 includes a first mesh area 610 and a second mesh area 620 formed along the central axis of the mica tape's length direction. The first mesh area 610 and the second mesh area 620 are located on opposite sides of the central axis and are interconnected. A convex rib 310 is formed on the side of the fiber layer 300 closest to the first mesh area 610, and a concave long groove 510 is formed on the outer side of the non-carbonized film layer 500. The length directions of the convex rib 310 and the long groove 510 are parallel to the length direction of the mica tape. After one wrap, the long groove 510 is fitted over the convex rib 310. Through the formed long groove 510 and convex rib 310, when wrapped around the outside of the cable, they can overlap, forming a half-overlap relationship between adjacent mica tape layers. After overlapping, the long groove 510 and convex rib 310 limit the movement, preventing adjacent mica tape layers from detaching, thus ensuring the stability of the product's fire resistance performance.

[0035] The first mesh area 610 includes multiple long ropes 611 parallel to the length of the mica tape and multiple short ropes 612 perpendicular to the length of the mica tape. The diameter of the long ropes 611 is 0.2-0.5 mm, and the diameter of the short ropes 612 is 0.05-0.1 mm. The long ropes 611 push the fiber layer 300 outward to form a ridge 310. The second mesh area 620 includes mesh-like fine ropes 621, with a diameter of 0.05-0.1 mm. Through the mesh-like first mesh area 610 and second mesh area 620, the ridge 310 can be formed after molding. During use, the grid-like first mesh area 610 and second mesh area 620 are fixed by the first adhesive layer 200, further providing force to the ridge 310 and preventing displacement of the long ropes 611 inside the ridge 310. This ensures the stability of the overlap between adjacent layers of mica tape after winding. The diameters of the short rope 612 and the thin rope 621 are designed to be 0.05-0.1 mm. After testing, the structure was found that when the diameters of the short rope 612 and the thin rope 621 are kept between 0.05-0.1 mm, they can provide good force while almost no trace of the short rope 612 and the thin rope 621 is visible on the outside of the fiber layer 300.

[0036] Example 2

[0037] A method for processing refractory mica tape, used to process the refractory mica tape in Example 1, includes the following steps:

[0038] S1. Prepare fiber cloth, mica paper, carbon-free film, and rope net.

[0039] S2. Mix the resin solution and diluent to prepare a glue solvent with a glue content of 19%-25%.

[0040] S3. Spray adhesive solvent onto one side of the fiber cloth. After spraying the adhesive solvent, lay a rope net on the top side of the sprayed adhesive solvent and spray adhesive solvent a second time to form the first adhesive layer 200.

[0041] S4. Mica paper is laid on the upper side of the first adhesive layer 200, adhesive flux is sprayed on the outer side of the mica paper, and then a carbon-free film is laid on the upper side of the sprayed adhesive flux.

[0042] S4. The composite is carried out by a laminating machine and then dried for the first time in a drying oven.

[0043] S5. Pressing is performed using a corresponding mold to form a long groove 510 on one side of the carbon-free thin film layer 500 and a raised ridge 310 on the other side.

[0044] S5. Perform secondary drying.

[0045] In step S4, the drying temperature during the first drying is 70-80 degrees Celsius.

[0046] The total drying time for the two stages is 7-10 minutes, including an initial drying stage, an intermediate drying stage, and a cooling stage. The initial drying stage lasts for 1-2 minutes and the drying temperature is 70-80 degrees Celsius. The intermediate drying stage lasts for 4-6 minutes and the drying temperature is 120-140 degrees Celsius.

[0047] This invention provides a fire-resistant mica tape and its processing method. A mesh layer 600 is disposed within the first adhesive layer 200. During the forming of the mica tape, a raised rib 310 is formed on the side of the mica tape near the first mesh area 610, and a long groove 510 is formed on the other side of the mica tape near the second mesh area 620. When the tape is wrapped around the outside of a cable and overlaps with each other, adjacent layers of mica tape form a half-overlap relationship. After the overlap, the limiting effect of the long groove 510 and the raised rib 310 prevents adjacent layers of mica tape from detaching, thereby ensuring the stability of the product's fire-resistant performance.

[0048] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Without conflict, the embodiments and features in the embodiments of this invention can be combined with each other.

[0050] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A fire-resistant mica tape, characterized in that: The structure includes a mica layer (100) in the middle, a first adhesive layer (200) coated on one side of the mica layer (100), a fiber layer (300) disposed on the outside of the first adhesive layer (200), a second adhesive layer (400) coated on the other side of the mica layer (100) away from the first adhesive layer (200), and a carbon-free thin film layer (500) disposed on the outside of the second adhesive layer (400). A mesh layer (600) is provided between the first adhesive layer (200) and the fiber layer (300). The mesh layer (600) includes a first mesh area (610) and a second mesh area (620) formed by dividing along the central axis of the mica strip length direction. The first mesh area (610) and the second mesh area (620) are located on both sides of the central axis, and the first mesh area (610) and the second mesh area (620) are connected to each other; The fiber layer (300) has an outwardly protruding ridge (310) on the side near the first mesh area (610). A concave long groove (510) is formed on the outer side of the carbon-free thin film layer (500); the length direction of the convex ridge (310) and the long groove (510) is parallel to the length direction of the mica strip; after one winding, the long groove (510) is sleeved on the outside of the convex ridge (310). The first mesh area (610) includes multiple long ropes (611) parallel to the length direction of the mica strip and multiple short ropes (612) perpendicular to the length direction of the mica strip. The diameter of the first long rope (611) is 0.2-0.5 mm, and the diameter of the short rope (612) is 0.05-0.1 mm. The first long rope (611) pushes the fiber layer (300) outward to form the convex ridge (310).

2. The refractory mica tape according to claim 1, characterized in that: The second net area (620) includes a mesh-like fine rope (621) with a diameter of 0.05-0.1 mm.

3. A method for processing refractory mica tape, used to process the refractory mica tape according to any one of claims 1-2, characterized in that: Includes the following steps: S1. Prepare fiber cloth, mica paper, carbon-free film and rope net; S2. Mix the resin solution and diluent to prepare a glue solvent with a glue content of 19%-25%; S3. Spray adhesive solvent onto one side of the fiber cloth. After spraying the adhesive solvent, lay a rope net on the top side of the sprayed adhesive solvent and spray adhesive solvent a second time to form the first adhesive layer (200). S4. Mica paper is laid on the upper side of the first adhesive layer (200), adhesive flux is sprayed on the outside of the mica paper, and then a carbon-free film is laid on the upper side of the sprayed adhesive flux. S4. The lamination is carried out by a laminating machine and then dried for the first time in a drying oven; S5. Pressing is performed using a corresponding mold to form a long groove (510) on one side of the carbon-free thin film layer (500) and a protruding ridge (310) on the other side. S5. Perform secondary drying.

4. The method for processing refractory mica tape according to claim 3, characterized in that: In step S4, the drying temperature during the first drying is 70-80 degrees Celsius.

5. The method for processing refractory mica tape according to claim 3, characterized in that: The total duration of the secondary drying is 7-10 minutes, including the initial drying stage, the intermediate drying stage, and the cooling stage; The drying time in the initial drying stage is 1-2 minutes, and the drying temperature in the initial drying stage is 70-80 degrees Celsius. The drying time for the intermediate drying stage is 4-6 minutes, and the drying temperature for the intermediate drying stage is 120-140 degrees Celsius.

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